<template>
  <el-container class="home-container">
    <!-- 头部区域   -->
    <el-header>
      <div>
        <span>房屋租赁后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--  页面主体内容  -->
    <el-container>
      <!-- 侧边栏     -->
      <el-aside :width="isCollaps ? '64px': '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域     -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF" unique-opened :collapse="isCollaps" :collapse-transition="false" router :default-active= "activePath" >
          <!-- 一级菜单         -->
          <el-submenu :index="item.id" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模板区域  -->
            <template slot="title">
              <!--  图标  -->
              <i class="el-icon-location"></i>
              <!-- 文本   -->
              <span>{{ item.title }}</span>
            </template>
            <!-- 二级菜单  -->
            <el-menu-item :index="subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState(subItem.path)">
              <!-- 二级菜单的模板区域  -->
              <template slot="title">
                <!--  图标  -->
                <i class="el-icon-menu"></i>
                <!-- 文本   -->
                <span>{{ subItem.title }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--  右侧内容主体    -->
      <el-main>
        <!--  路由占位符      -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'Home',
  data () {
    return {
      // 左侧菜单
      menuList: [{
        id: '1',
        title: '管理用户',
        path: '/mgr',
        children: [{
          id: '1-1',
          title: '用户列表',
          path: '/users',
          children: []
        }, {
          id: '1-2',
          title: '租客列表',
          path: '/guests',
          children: []
        }
        ]
      }, {
        id: '2',
        title: '房源管理',
        path: '/houseManage',
        children: [{
          id: '2-1',
          title: '闲置房源',
          path: '/idle',
          children: []
        }, {
          id: '2-2',
          title: '出租房源',
          path: '/sold',
          children: []
        }, {
          id: '2-3',
          title: '添加房源',
          path: '/addHouse',
          children: []
        }
        ]
      }, {
        id: '3',
        title: '个人信息',
        path: '/info',
        children: [{
          id: '3-1',
          title: '修改个人信息',
          path: '/update',
          children: []
        }]
      }],
      // 是否折叠
      isCollaps: false,
      // 被激活的链接
      activePath: ''
    }
  },
  created () {
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      // 页面跳转
      this.$router.push('/login')
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollaps = !this.isCollaps
    },
    //  保存链接激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
}

.el-aside {
  background-color: #333744;

  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #EAEDF1;
}

.toggle-button {
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
